that's the broadcast from japan tonight. "this week" with christiane amanpour tomorrow morning, and diane sawyer reports here this weekend. she'll be here for "world news" starting on monday, and don't forget "gma" first thing in the morning. for all of us at abc news, thanks for watching, and good night from japan. >> alan: this is the moment of the blast. an explosion and the wall around a nuclear rerackettor collapses. the growing concern for a nation ratted -- rattled by the friday's disaster. thousand ares still missing following the 8.9 earthquake and tsunami. the official death toll is 686 and the government says that figure could go well beyond 1,000. for those who survived, their concerns are focused on